Yeah, I'm stumped on this one too. I am almost positive it is related to the raccoon, but I can't figure out the combination of traits and choices that lead to the ending.
I think it might be the fox and bear bar tenders or something else in that room, but none of my attempts have worked so far. I made that guess because there's an image file called "merchandise_end1" but that might be one or the snake ends.
The raccoon has no endings, neither do the bartenders or the feet squirrels. Those are just bonus lewd scenes. You get "The sluttiest tool in the box" being being in the medical room without speed or charm.
It's a tough one bc you have to fail two checks to get it. Get to the medical room with knowledge and willpower. You will fail the charm and speed checks and reach a bad end.